Merge branch 'phy-broadcom-wirespeed-downshift-support'

Florian Fainelli says:

====================
net: phy: broadcom: Wirespeed/downshift support

This patch series adds support for the Broadcom Wirespeed, aka
downsfhit feature utilizing the recently added ethtool PHY tunables.

Tested with two Gigabit link partners with a 4-wire cable having only
2 pairs connected.

Last patch in the series is a fix that was required for testing, which
should make it to -stable, which I can submit separate against net if
you prefer David.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 187 insertions, 22 deletions

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index e3ee27ce13dd..9ec33b51a0ed 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -588,6 +588,7 @@ static void bcm_sf2_sw_adjust_link(struct dsa_switch *ds, int port,
 				   struct phy_device *phydev)
 {
 	struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
+	struct ethtool_eee *p = &priv->port_sts[port].eee;
 	u32 id_mode_dis = 0, port_mode;
 	const char *str = NULL;
 	u32 reg;
@@ -662,6 +663,9 @@ force_link:
 		reg |= DUPLX_MODE;
 
 	core_writel(priv, reg, CORE_STS_OVERRIDE_GMIIP_PORT(port));
+
+	if (!phydev->is_pseudo_fixed_link)
+		p->eee_enabled = bcm_sf2_eee_init(ds, port, phydev);
 }
 
 static void bcm_sf2_sw_fixed_link_update(struct dsa_switch *ds, int port,
diff --git a/drivers/net/phy/bcm-cygnus.c b/drivers/net/phy/bcm-cygnus.c
index 49bbc6826883..196400cddf68 100644
--- a/drivers/net/phy/bcm-cygnus.c
+++ b/drivers/net/phy/bcm-cygnus.c
@@ -104,7 +104,7 @@ static int bcm_cygnus_config_init(struct phy_device *phydev)
 		return rc;
 
 	/* Advertise EEE */
-	rc = bcm_phy_enable_eee(phydev);
+	rc = bcm_phy_set_eee(phydev, true);
 	if (rc)
 		return rc;
 
diff --git a/drivers/net/phy/bcm-phy-lib.c b/drivers/net/phy/bcm-phy-lib.c
index df0416db0b88..3156ce6d5861 100644
--- a/drivers/net/phy/bcm-phy-lib.c
+++ b/drivers/net/phy/bcm-phy-lib.c
@@ -50,6 +50,23 @@ int bcm_phy_read_exp(struct phy_device *phydev, u16 reg)
 }
 EXPORT_SYMBOL_GPL(bcm_phy_read_exp);
 
+int bcm54xx_auxctl_read(struct phy_device *phydev, u16 regnum)
+{
+	/* The register must be written to both the Shadow Register Select and
+	 * the Shadow Read Register Selector
+	 */
+	phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum |
+		  regnum << MII_BCM54XX_AUXCTL_SHDWSEL_READ_SHIFT);
+	return phy_read(phydev, MII_BCM54XX_AUX_CTL);
+}
+EXPORT_SYMBOL_GPL(bcm54xx_auxctl_read);
+
+int bcm54xx_auxctl_write(struct phy_device *phydev, u16 regnum, u16 val)
+{
+	return phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum | val);
+}
+EXPORT_SYMBOL(bcm54xx_auxctl_write);
+
 int bcm_phy_write_misc(struct phy_device *phydev,
 		       u16 reg, u16 chl, u16 val)
 {
@@ -178,7 +195,7 @@ int bcm_phy_enable_apd(struct phy_device *phydev, bool dll_pwr_down)
 }
 EXPORT_SYMBOL_GPL(bcm_phy_enable_apd);
 
-int bcm_phy_enable_eee(struct phy_device *phydev)
+int bcm_phy_set_eee(struct phy_device *phydev, bool enable)
 {
 	int val;
 
@@ -188,7 +205,10 @@ int bcm_phy_enable_eee(struct phy_device *phydev)
 	if (val < 0)
 		return val;
 
-	val |= LPI_FEATURE_EN | LPI_FEATURE_EN_DIG1000X;
+	if (enable)
+		val |= LPI_FEATURE_EN | LPI_FEATURE_EN_DIG1000X;
+	else
+		val &= ~(LPI_FEATURE_EN | LPI_FEATURE_EN_DIG1000X);
 
 	phy_write_mmd_indirect(phydev, BRCM_CL45VEN_EEE_CONTROL,
 			       MDIO_MMD_AN, (u32)val);
@@ -199,14 +219,103 @@ int bcm_phy_enable_eee(struct phy_device *phydev)
 	if (val < 0)
 		return val;
 
-	val |= (MDIO_AN_EEE_ADV_100TX | MDIO_AN_EEE_ADV_1000T);
+	if (enable)
+		val |= (MDIO_AN_EEE_ADV_100TX | MDIO_AN_EEE_ADV_1000T);
+	else
+		val &= ~(MDIO_AN_EEE_ADV_100TX | MDIO_AN_EEE_ADV_1000T);
 
 	phy_write_mmd_indirect(phydev, BCM_CL45VEN_EEE_ADV,
 			       MDIO_MMD_AN, (u32)val);
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(bcm_phy_enable_eee);
+EXPORT_SYMBOL_GPL(bcm_phy_set_eee);
+
+int bcm_phy_downshift_get(struct phy_device *phydev, u8 *count)
+{
+	int val;
+
+	val = bcm54xx_auxctl_read(phydev, MII_BCM54XX_AUXCTL_SHDWSEL_MISC);
+	if (val < 0)
+		return val;
+
+	/* Check if wirespeed is enabled or not */
+	if (!(val & MII_BCM54XX_AUXCTL_SHDWSEL_MISC_WIRESPEED_EN)) {
+		*count = DOWNSHIFT_DEV_DISABLE;
+		return 0;
+	}
+
+	val = bcm_phy_read_shadow(phydev, BCM54XX_SHD_SCR2);
+	if (val < 0)
+		return val;
+
+	/* Downgrade after one link attempt */
+	if (val & BCM54XX_SHD_SCR2_WSPD_RTRY_DIS) {
+		*count = 1;
+	} else {
+		/* Downgrade after configured retry count */
+		val >>= BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_SHIFT;
+		val &= BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_MASK;
+		*count = val + BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_OFFSET;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(bcm_phy_downshift_get);
+
+int bcm_phy_downshift_set(struct phy_device *phydev, u8 count)
+{
+	int val = 0, ret = 0;
+
+	/* Range check the number given */
+	if (count - BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_OFFSET >
+	    BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_MASK &&
+	    count != DOWNSHIFT_DEV_DEFAULT_COUNT) {
+		return -ERANGE;
+	}
+
+	val = bcm54xx_auxctl_read(phydev, MII_BCM54XX_AUXCTL_SHDWSEL_MISC);
+	if (val < 0)
+		return val;
+
+	/* Se the write enable bit */
+	val |= MII_BCM54XX_AUXCTL_MISC_WREN;
+
+	if (count == DOWNSHIFT_DEV_DISABLE) {
+		val &= ~MII_BCM54XX_AUXCTL_SHDWSEL_MISC_WIRESPEED_EN;
+		return bcm54xx_auxctl_write(phydev,
+					    MII_BCM54XX_AUXCTL_SHDWSEL_MISC,
+					    val);
+	} else {
+		val |= MII_BCM54XX_AUXCTL_SHDWSEL_MISC_WIRESPEED_EN;
+		ret = bcm54xx_auxctl_write(phydev,
+					   MII_BCM54XX_AUXCTL_SHDWSEL_MISC,
+					   val);
+		if (ret < 0)
+			return ret;
+	}
+
+	val = bcm_phy_read_shadow(phydev, BCM54XX_SHD_SCR2);
+	val &= ~(BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_MASK <<
+		 BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_SHIFT |
+		 BCM54XX_SHD_SCR2_WSPD_RTRY_DIS);
+
+	switch (count) {
+	case 1:
+		val |= BCM54XX_SHD_SCR2_WSPD_RTRY_DIS;
+		break;
+	case DOWNSHIFT_DEV_DEFAULT_COUNT:
+		val |= 1 << BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_SHIFT;
+		break;
+	default:
+		val |= (count - BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_OFFSET) <<
+			BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_SHIFT;
+		break;
+	}
+
+	return bcm_phy_write_shadow(phydev, BCM54XX_SHD_SCR2, val);
+}
+EXPORT_SYMBOL_GPL(bcm_phy_downshift_set);
 
 MODULE_DESCRIPTION("Broadcom PHY Library");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/net/phy/bcm-phy-lib.h b/drivers/net/phy/bcm-phy-lib.h
index b2091c88b44d..a117f657c6d7 100644
--- a/drivers/net/phy/bcm-phy-lib.h
+++ b/drivers/net/phy/bcm-phy-lib.h
@@ -19,6 +19,9 @@
 int bcm_phy_write_exp(struct phy_device *phydev, u16 reg, u16 val);
 int bcm_phy_read_exp(struct phy_device *phydev, u16 reg);
 
+int bcm54xx_auxctl_write(struct phy_device *phydev, u16 regnum, u16 val);
+int bcm54xx_auxctl_read(struct phy_device *phydev, u16 regnum);
+
 int bcm_phy_write_misc(struct phy_device *phydev,
 		       u16 reg, u16 chl, u16 value);
 int bcm_phy_read_misc(struct phy_device *phydev,
@@ -33,5 +36,10 @@ int bcm_phy_config_intr(struct phy_device *phydev);
 
 int bcm_phy_enable_apd(struct phy_device *phydev, bool dll_pwr_down);
 
-int bcm_phy_enable_eee(struct phy_device *phydev);
+int bcm_phy_set_eee(struct phy_device *phydev, bool enable);
+
+int bcm_phy_downshift_get(struct phy_device *phydev, u8 *count);
+
+int bcm_phy_downshift_set(struct phy_device *phydev, u8 count);
+
 #endif /* _LINUX_BCM_PHY_LIB_H */
diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
index 9636da0b6efc..5b3be4c67be8 100644
--- a/drivers/net/phy/bcm7xxx.c
+++ b/drivers/net/phy/bcm7xxx.c
@@ -167,6 +167,7 @@ static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
 {
 	u8 rev = PHY_BRCM_7XXX_REV(phydev->dev_flags);
 	u8 patch = PHY_BRCM_7XXX_PATCH(phydev->dev_flags);
+	u8 count;
 	int ret = 0;
 
 	pr_info_once("%s: %s PHY revision: 0x%02x, patch: %d\n",
@@ -199,7 +200,12 @@ static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
-	ret = bcm_phy_enable_eee(phydev);
+	ret = bcm_phy_downshift_get(phydev, &count);
+	if (ret)
+		return ret;
+
+	/* Only enable EEE if Wirespeed/downshift is disabled */
+	ret = bcm_phy_set_eee(phydev, count == DOWNSHIFT_DEV_DISABLE);
 	if (ret)
 		return ret;
 
@@ -303,6 +309,47 @@ static int bcm7xxx_suspend(struct phy_device *phydev)
 	return 0;
 }
 
+static int bcm7xxx_28nm_get_tunable(struct phy_device *phydev,
+				    struct ethtool_tunable *tuna,
+				    void *data)
+{
+	switch (tuna->id) {
+	case ETHTOOL_PHY_DOWNSHIFT:
+		return bcm_phy_downshift_get(phydev, (u8 *)data);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int bcm7xxx_28nm_set_tunable(struct phy_device *phydev,
+				    struct ethtool_tunable *tuna,
+				    const void *data)
+{
+	u8 count = *(u8 *)data;
+	int ret;
+
+	switch (tuna->id) {
+	case ETHTOOL_PHY_DOWNSHIFT:
+		ret = bcm_phy_downshift_set(phydev, count);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	if (ret)
+		return ret;
+
+	/* Disable EEE advertisment since this prevents the PHY
+	 * from successfully linking up, trigger auto-negotiation restart
+	 * to let the MAC decide what to do.
+	 */
+	ret = bcm_phy_set_eee(phydev, count == DOWNSHIFT_DEV_DISABLE);
+	if (ret)
+		return ret;
+
+	return genphy_restart_aneg(phydev);
+}
+
 #define BCM7XXX_28NM_GPHY(_oui, _name)					\
 {									\
 	.phy_id		= (_oui),					\
@@ -315,6 +362,8 @@ static int bcm7xxx_suspend(struct phy_device *phydev)
 	.config_aneg	= genphy_config_aneg,				\
 	.read_status	= genphy_read_status,				\
 	.resume		= bcm7xxx_28nm_resume,				\
+	.get_tunable	= bcm7xxx_28nm_get_tunable,			\
+	.set_tunable	= bcm7xxx_28nm_set_tunable,			\
 }
 
 #define BCM7XXX_40NM_EPHY(_oui, _name)					\
diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index b1e32e9be1b3..409b365f12b1 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -30,21 +30,6 @@ MODULE_DESCRIPTION("Broadcom PHY driver");
 MODULE_AUTHOR("Maciej W. Rozycki");
 MODULE_LICENSE("GPL");
 
-static int bcm54xx_auxctl_read(struct phy_device *phydev, u16 regnum)
-{
-	/* The register must be written to both the Shadow Register Select and
-	 * the Shadow Read Register Selector
-	 */
-	phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum |
-		  regnum << MII_BCM54XX_AUXCTL_SHDWSEL_READ_SHIFT);
-	return phy_read(phydev, MII_BCM54XX_AUX_CTL);
-}
-
-static int bcm54xx_auxctl_write(struct phy_device *phydev, u16 regnum, u16 val)
-{
-	return phy_write(phydev, MII_BCM54XX_AUX_CTL, regnum | val);
-}
-
 static int bcm54810_config(struct phy_device *phydev)
 {
 	int rc, val;
diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index 848dc508ef57..f9f8aaf9c943 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -114,6 +114,7 @@
 #define MII_BCM54XX_AUXCTL_SHDWSEL_MISC	0x0007
 #define MII_BCM54XX_AUXCTL_SHDWSEL_READ_SHIFT	12
 #define MII_BCM54XX_AUXCTL_SHDWSEL_MISC_RGMII_SKEW_EN	(1 << 8)
+#define MII_BCM54XX_AUXCTL_SHDWSEL_MISC_WIRESPEED_EN	(1 << 4)
 
 #define MII_BCM54XX_AUXCTL_SHDWSEL_MASK	0x0007
 
@@ -130,6 +131,7 @@
 #define BCM_LED_SRC_INTR	0x6
 #define BCM_LED_SRC_QUALITY	0x7
 #define BCM_LED_SRC_RCVLED	0x8
+#define BCM_LED_SRC_WIRESPEED	0x9
 #define BCM_LED_SRC_MULTICOLOR1	0xa
 #define BCM_LED_SRC_OPENSHORT	0xb
 #define BCM_LED_SRC_OFF		0xe	/* Tied high */
@@ -141,6 +143,14 @@
  * Shadow values go into bits [14:10] of register 0x1c to select a shadow
  * register to access.
  */
+
+/* 00100: Reserved control register 2 */
+#define BCM54XX_SHD_SCR2		0x04
+#define  BCM54XX_SHD_SCR2_WSPD_RTRY_DIS	0x100
+#define  BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_SHIFT	2
+#define  BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_OFFSET	2
+#define  BCM54XX_SHD_SCR2_WSPD_RTRY_LMT_MASK	0x7
+
 /* 00101: Spare Control Register 3 */
 #define BCM54XX_SHD_SCR3		0x05
 #define  BCM54XX_SHD_SCR3_DEF_CLK125	0x0001